Donald Trump has a lot of things to say about global warming. He’s called it an urgent problem, and he’s called it a hoax. He’s claimed it’s a scam invented by the Chinese, and he’s denied that he ever said that. He’s promised to “cancel” the historic Paris climate agreement, and he’s said he still has an “open mind” on the matter.

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Some environmental activists pointed to Trump’s unpredictable statements as evidence that he might not follow through on his campaign pledges to dismantle the Obama administration’s climate legacy. But just weeks after the 2016 election, one of his top aides assured Americans that Trump still believes climate science is mostly “bunk.” And now Trump has signed an executive order rolling back key Obama-era limits on greenhouse gas emissions.

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For those keeping score at home, here’s a timeline of the Donald’s thoughts and actions on global warming. We’ll update it from time to time.

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12/6/09 letter

Trump signs a letter calling for urgent climate action. As Grist reported in 2016, Trump and three of his children signed a 2009 letter to President Barack Obama calling for a global climate deal. “We support your effort to ensure meaningful and effective measures to control climate change, an immediate challenge facing the United States and the world today,” declared the letter, which was signed by dozens of business leaders and published as an ad in the New York Times. “If we fail to act now, it is scientifically irrefutable that there will be catastrophic and irreversible consequences for humanity and our planet.”

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2/14/10

Trump changes his mind, says Gore should be stripped of Nobel Prize because it’s cold outside. According to the New York Post, Trump had changed his tune by early 2010, telling an audience at one of his golf clubs, “With the coldest winter ever recorded, with snow setting record levels up and down the coast, the Nobel committee should take the Nobel Prize back from Al GoreGore wants us to clean up our factories and plants in order to protect us from global warming, when China and other countries couldn’t care less. It would make us totally noncompetitive in the manufacturing world, and China, Japan and India are laughing at America’s stupidity.” (He would later say he was joking about the Nobel Prize being rescinded.)

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2/16/10

Trump claims scientists admitted global warming is a “con.” Around this time, Trump caught wind of the so-called “ClimateGate scandal,” in which climate deniers wrongly claimed a trove of hacked emails showed that scientists had conspired to fabricate evidence of global warming. Trump said (inaccurately) on Fox News that there was an email “sent a couple months ago by one of the leaders of global warming, the initiativealmost sayingI guess they’re saying it’s a con.” He added that “in Washington, where I’m building a big development, nobody can move because we have 48 inches of snow.”

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11/6/12
“The concept of global warming was created by and for the Chinese.”

Donald J. Trump ? @realDonaldTrump

The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.
2:15 PM – 6 Nov 2012